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    * {
      margin: 0;
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    li {
      list-style: none;
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    img {
      width: 100%;
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    .box {
      width: 249px;
      height: 210px;
      margin: 50px auto;
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    .box p {
      color: #3b3b3b;
      padding: 10px 10px 0 10px;
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    .box li {
      overflow: hidden;
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    .pic {
      position: relative;
    }

    /* 拜摆放播放按钮， 定位图片中间 */
    .pic::after {
      position: absolute;
      left: 50%;
      top: 50%;
      /* transform: translate(-50%, -50%); */
      margin-top: -29px;
      margin-left: -29px;
      content: '';
      width: 58px;
      height: 58px;
      background-image: url(./images/play.png);
      opacity: 0;
      transform: scale(5);
      transition: all .5s;
    }

    /* hover 效果：大按钮 透明度0， 小按钮 透明度 1 */
    .box li:hover .pic::after {
      opacity: 1;
      transform: scale(1);

    }
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        <div class="pic">
          <img src="./images/party.jpeg" alt="" />
        </div>
        <p>【和平精英】“初火”音乐概念片：四圣觉醒......</p>
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